Why do people insist on lining the entire inside of the van like people on youtube do?
Why not buy a fridge van thats already insulated?
Or just build a small insulated compartment inside the van where you sleep?
You could probably fit one of these in your average van.
https://www.washingtonpost.com/news/morning-mix/wp/2016/03/29/man-moves-to-san-francisco-pays-400-a-month-to-sleep-in-wooden-box-inside-friends-living-room/?utm_term=.31b44ce81c28